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https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-1730
Change Image Download URL
Basically, you need to change both the external & internal download hostname to a different domain name.
Launch the Exchange Management Shell, and execute the following commands
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Set-OwaVirtualDirectory -Identity "owa (default Web site)" -ExternalDownloadHostName “Images.DeepnetID.com" Set-OwaVirtualDirectory -Identity "owa (default Web site)" -InternalDownloadHostName "Images.DeepnetID.com" Set-OrganizationConfig -EnableDownloadDomains $true |
If MFA is enabled on OWA, then you must take the following steps
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